Brake caliper FN 44 piston, removing and installing

Brake caliper FN 44 piston, removing and installing

Special tools, testers and auxiliary items required





^ Trim Removal Wedge 3409





^ Piston Resetting Tool T10145





^ Assembly Device for Protective Cap T10146/1

Removing





- Force piston from brake caliper using compressed air.

Place a wooden board into the recess of the caliper housing so it is not damaged.





- Pry off protective cap from brake caliper using Trim Removal Wedge 3409.

A - Protective covers





- Remove seal using Trim Removal Wedge 3409.

When removing, make sure that surface of cylinder is not damaged.

Installing
- The surface of the piston and seal must only be cleaned with mineral spirits and then dried.
- Thinly coat piston and seal with Assembly Paste G 052 150 A2 before inserting.
- Install sealing ring in brake caliper.





- Insert protective cap - A - into Assembly Tool T10146/4 - 1 -.





- Press the protective cap with the Assembly Tool T10146/4 - 1 - and the Piston Resetting Tool T10145 - 2 - into the brake caliper applying equal pressure all around.

Ensure protective caps are seated:





- Protective cap must no longer be able to be pulled from brake caliper by hand.





- Press piston lightly on to protective cap and then secure it in this position using e.g. Trim Removal Wedge 3409 - 2 -.

Do not angle piston, to avoid damaging the seal sleeve.

- Blow compressed air (max. 3 bar) on to protective cap - 1 -. Protective cap springs onto piston.

A - Protective covers





- Press piston into brake caliper using Piston Resetting Tool T10145 - 1 -.

Outer sealing lip of protective cap will then engage in piston groove.